Desamino**1-arginine**8-vasopressin



United States Patent 4 Int. Cl. C07c i 03/52; A61k 25/00 US. Cl. 260--112.5 Claim ABSTRACT OF THE DISCLOSURE The compound desamino -Arg -vasopressin, which differs from the natural human vasopressin, Arg -vasopressin because of the replacement of the terminal amino group with a hydrogen atom, exhibits an antidiuretic activity more than three times the activity of the natural human vasopressin. The pressor eifect is somewhat lower than the pressor eflect of the natural product.

The present invention relates to a new polypeptide and a process for its production.

The present invention provides the polypeptide of Formula I,

0 ONE! 3,454,549 Patented July 8, 1969 "ice is oxidized in manner known per se and subsequently the resulting polypeptide I is optionally converted into its acid addition salts with organic or inorganic acids in manner known per se.

The oxidation of the polypeptide V to give the desired final product I is preferably effected with hydrogen peroxide, potassium ferricyanide or 1,2-diiodoethane in aqueous or aqueous organic solution at a pH value of from 4 to 9. An aqueous alcoholic solution or a mixture of acetone and water may, for example, be used as the aqueous organic solution.

The polypeptide V may be obtained by splitting off the protective radicals R and R" in one or more stages from an octapeptide derivative of general Formula IV (in column 3), in which R denotes a radical capable of protecting a sulfhydryl radical in peptide synthesis, and

R" denotes a radical capable of protecting a guanido radical in peptide synthesis.

The octapeptide derivative IV may be obtained by known methods for the synthesis of peptides, it being possible to join together the amino acid and fi-mercaptopropionic acid in the order indicated in general Formula IV one at a time or by first forming constituent peptide units and joining these together.

05114011 05115 (3H C ONH:

Ha Ha 6H1 H3 1 2 3 4 5 6 Mpr Tyr Phe Glu Asp Cys and its acid addition salts. The term known methods as utilized herein desig- The present invention further provides a process for nates methods in use or described in the literature on the the production of Compound I and its acid addition salts, subject. characterized in that a polypeptide of Formula V,

CONH:

SH CtHtOH CtHs Hz CONE: SH CH2 2 H2 1H1 H: H: (BH2C0-NH-(BH-C ONH( JHC O--NH1H-C O-NH-(BH-C ONH-CH-C O 1 2 3 4 5 6 Mpr Tyr Phe Glu Asp Cys NH-C-NHz Hz l IH CHr-CH: H2 H5 (IJHQ N-(ilH-C ONH--JJHCONHCHr-CONHI 7 8 9 Pro Arg Gly V Mpr Tyr Phe Glu Asp Cys The octapeptide derivative IV may, for example, be produced in that a hexapeptide derivative of general Formula II,

Examples of radicals for protecting the sulfhydryl radical in the above process by temporarily blocking it are the benzyl or p-xylyl radicals, which examples of radicals 0 ONE; II: NH

H, O ONI-I SR' Gin-CH, In 6H: 2 5H: H2 H2 NH,- 'JHG0NH(iH-O 0-NH-c H-C 0-N--- :H-C O-NH-( H-C 0-NH-CH4-0 ONH: Glu Asp Oys Pro Arg Gly 11 in which for 4 protecting the guanido raidcal are the p-toluenesul- R and R" have the above significance,

is condensed with a reactive derivative of a free acid of general Formula III,

R has the above significance.

fonyl or benzenesulfonyl radicals.

It should be noted that the octapeptide derivative IV need not be produced in the manner described above as it may also be produced by condensation of two polypeptides other than the ones indicated above (or a polypeptide and an amino acid) in the form of their protected 45 derivatives, or an octapeptide and B-mercaptopropionic acid in the form of their protected derivatives.

Compound I, which may be called Desamino -Arg vasopressin, has an antidiuretic effect which is considerably stronger than that of natural human vasopressin,

Arg -vasopressin of Formula VI,

from which the new compound differs in that it does not have an a-amino radical at one end of the peptide chain.

With its antidiuretic effect of 1300 I.U./mg. Desamino -Arg -vasopressin is the most effective hitherto known compound in the field of polypeptide hormones of the posterior lobe of the hypophysis.

Upon comparing the effects expressed in International Units (I.U.) it may be seen that natural arginine vasopressin has a pressoric effect which is as strong as its antidiuretic effect, whereas Compound I has a pressoric effect which amounts to only approximately one-fourth of its antidiuretic effect. The antidiuretic effect in comparison with the pressoric effect is therefore more selective in Compound I than in natural arginine vasopressin.

Compound I is especially indicated for use in the treatment of diabetes insipidus, certain cases of hypotonia, collapse and shock conditions. The higher degree of action and the greater stability of the new Compound I in comparison with arginine vasopressin are especially advantageous.

The improved antidiuretic effect of Compound I in comparison with arginine vasopressin could, therefore, not be foreseen, since it is known that the removal of the terminal amino radical of lysine vasopressin only alters the antidiuretic properties of this hormone very slightly. The dosage of Compound I should be adapted to the individual degree of hormone deficiency which may vary considerably and has a range of to 15 LU. administered 3 to 4 times daily subcutaneously or intramuscularly.

The polypeptide of the invention may be used in the form of free base or salt of an organic or inorganic acid or an acid radical containing polymer (e.g. alginic acid, carboxymethyl cellulose, tannic acid), either as pharmaceutical on its own or in the form of appropriate medicinal preparations, e.g. for oral, parenteral, enteral or intranasal administration. In order to produce suitable medicinal preparations the compounds are worked up with inorganic or organic adjuvants which are inert and pharmacologically acceptable. Examples of such adjuvants are:

tablets: lactose, starch, talc and stearic acid;

injectable solutions: water, alcohols, glycerin and vegetable oils;

suppositories: natural or hardened oils and waxes;

intranasal sprays: water, glycerin and other liquid substances tolerated by the mucous membrane.

The preparations may furthermore contain suitable preserving, stabilizing and wetting agents, solubilizers, sweetening and coloring substances and flavorings.

In the following examples all temperatures are indicated in degrees Centigrade.

EXAMPLE 1.POLYPEPTIDE I (a) S-benzyl-B-mercaptopropionic acid 2,4,5- trichlorophenyl ester 20 g. of S-benzyl-fi-mercaptopropionic acid and 22 g. of 2,4,5-trichlorophenol are dissolved in 170 cc. of ethyl acetate and 20 ml. of acetonitrile, cooling is effected at l0 and then 21 g. of dicyclohexylcarbodiimide are added. The solution is shaken for 4 hours at room temperature, the dicyclohexylurea precipitate is filtered with suction and the filtrate is evaporated in a vacuum at 30. The residue is dissolved in ethyl acetate and the solution is washed with aqueous sodium bicarbonate and then with water. After drying over sodium sulfate the ethyl acetate is evaporated. The residue is left to stand at whereby S-benzyl-fi-mercaptopropionic acid 2,4,5-trichlorophenyl ester, having a melting point of 17, crystallizes.

(b) O,N-dicarbobenzoxy-L-tyrosyl-L-phenylalanine methyl ester 47 g. of L-phenylalaninemethyl ester in 300 cc. of dimethylformamide are added to 157 g. of O,N-dicarbobenzoxy-L-tyrosine 2,4,5-trichlorophenyl ester. After 16 hours dilution is effected with 600 cc. of ethyl acetate. The resulting precipitate is filtered with suction and washed with ethyl acetate, ether, N hydrochloric acid and water. After drying in a high vacuum at 40 O,N-dicarbobenzoxy-L-tyrosyl-L-phenylalanine methyl ester, having a melting point of 187, [a]. =--16 (dimethylformamide), is obtained.

(c) S-benzyl-p-mercaptopropionyl-L-tyrosyl-L- phenylalanine methyl ester 92 g. of O,N-dicarbobenzoxy-L-tyrosyl-L-phenylalanine methyl ester are dissolved in 900' cc. of anhydrous acetic acid which have been saturated with hydrogen bromide. The solution is left to stand for one hour at 20, evaporation is effected in a vacuum below 40 and the residue is carefully washed with diethyl ether. The residue is dissolved in 360 ml. of water at 0, 22 g. of potassium carbonate are added and extraction is effected with ethyl acetate at 0. After drying over sodium sulfate 55 g. of S-benzyl-fi-mercaptopropionic acid 2,4,5-trichlorophenyl ester are added and the mixture is left to stand for 15 hours at 20. The solution is washed with dilute hydrochloric acid and aqueous sodium bicarbonate, drying is effected over sodium sulfate and the ethyl acetate is evaporated in a vacuum at 30. The residue is washed with ether/petroleum ether (1:2). After drying in a high vacuum at 40 S-benzyl-fi-mercaptopropionyl-L-tyrosyl- L-phenylalanine methyl ester, having a melting point of 149, [a] =18 (dimethylformamide), is obtained.

(d) S-benzyl-B-mercaptopropionyl-L-tyrosyl-L- phenylalanine-hydrazide 52 g. of S benzyl-fl-mercaptopropionyl-btyrosyl-L- phenylalaniline-methyl ester are dissolved in 260 cc. of anhydrous methanol, 32 cc. of anhydrous hydrazine are added and the mixture is left to stand for 15 hours at 20. The precipitate is filtered with suction and washed with methanol. After drying in a vacuum at 50 S-benzyll9 mercaptopropionyl L tyrosyl L phenylalaninehydrazide, having a melting point of 253,

(0.3 N HCl in 96% acetic acid), is obtained.

(e) S benzyl B mercaptopropionyl L tyrosyl- L phenylalanyl L glutaminyl L asparaginyl- S benzyl L cysteinyl L prolyl G tosyl- L-arginyl-glycinamide 33 g. of S benzyl ,8 mercaptopropionyl-L-tyrosyl- L phenylalanine hydrazide are dissolved in a mixture of 250 ml. of dimethylformamide, 250 ml. of isopropanol and 32 cc. of 6 N hydrochloric acid, cooling is effected at 5 and 13.5 ml. of a 5 N solution of sodium nitrite in water are added whilst stirring. After 5 minutes the resulting solution is poured into 1.6 litres of a 0.25 N solution of sodium bicarbonate in water. The precipitate which forms is filtered with suction, washed with water, dried in a high vacuum at 2 and a solution of 50 g. of L glutaminyl L asparaginyl S benzyl L-cysteinyl- L proylyl G tosyl L arginyl glycinamide in 300 ml. of dimethylformamide is added. The mixture is left to stand for 2 days, 1200 cc. of ethyl acetate are subsequently added and the precipitate is washed with ethyl acetate. After drying at 30 the product is washed with warm methanol. S benzyl ,8 mercaptopropionyl- L- tyrosyl L phenylalanyl L glutaminyl L- asparaginyl S benzyl L cysteinyl L prolyl G- 7 tosyl L arginyl glycinamide, having a melting point of 197, [u] =-37 (dimethylformamide), is obtained.

(f) 13 mercaptopropionyl L tyrosyl L phenyland electrophoresis. Migration in paper electrophoresis at a pH value of 5.8 and 40 v./cm.: 30 in 60 minutes (the histidine used as reference migrates 72 mm.). Migration in paper electrophoresis at a pH value of 1.9 and 40 v./cm.: 34 mm. in 60 minutes (the t ilanyl L gll-1tammy1- L -asparagmyl L cys emy 5 ti'yptophane used as reference migrates 62 mm.). Rf in -pro1yl-L-arglnyl-glyclnamlde paper chromatography 1n the system isoamyl alcohol/ Th necessary amount of sodlum r potasslum metal pyridine/water 35:35:30: 0.27. Total hydrolysis (16 5 dde to a solution of 5 of S benzyl B mercaptohours, 110, HCl 6 N) yields the following amino acids P P Y y 053/1 L p y lf L glutamlnylin equimolecular quantities: tyrosine, phenylalanine, L aspafaglnyl beIlZY1 j L y f y L P Y glutaminic acid, asparaginic acid, proline, arginine and Q y lf glyclnamldc 111 1200 Q of glycine; and the diflFerent disulfides of cysteine and 13- llquid ammonia to give a stable blue coloration. After mercaptopropionic ,acid 23 5 in 01 N acetic the addition of 1.5 g. of ammonium chloride the solui tion is evaporated to dryness. The residue contains 6- 15 mercaptopropionyl L tyrosyl L phenylalanyl-L- EXAMPLE 2 glutaminyl L asparaginyl L cysteinyl L prolyl- The same procedure as in Example 1 is used, except L-arginyl-glycinamide and may be worked up further as that final oxidation is effected at 0-35 by the addition such. of 7.1 cc. of a N solution of potassium ferricyanide in (g) Polypeptide compound I water at a pH value of 5.0-9.0. The residue obtained in (f) above is dissolved in 4 EXAMPLE 3 liters of 0.01 N acetic acid and is oxidized at a pH value The same procedure as in Example 1 is used, except of 6.5-9.0 by the addition of 7.5 cc. of a N solution that final oxidation is effected at 0-35 by the addition of hydrogen peroxide in water. The pH value of the soluof 1.05 g. of 1,2 diiodoethane dissolved in acetone, at tion is adjusted to 4.5 by the addition of dilute hydroa pH value of 5.5-8.5. After oxidation the excess of 1,2- chloric acid and after the addition of g. of sodium diiodoethane is extracted with ethyl acetate. The ethyl chloride or 0.34 g. of methanesulfonic acid or 0.405 g. acetate remaining in the aqueous solution is removed in of trifiuoroacetic acid, evaporation to dryness is effected, a vacuum at 20. whereby a dry powder results which keeps well. It may 30 What is claimed is: be stored and when used it may be dissolved to give 1. The polypeptide of formula:

OONH:

uHloH sHs I H: $ONH9 Hi H: CH2 CH2 OH:CO-NH-OHCONHCHC O-NH(5HC O-NHJJHC O-NH-CH-O 0 $112 (EH1 s i Mpr Tyr Phe Glu Asp Cys NH-(||J--NH2 (ilHz NH CHr-CH: H2 H2 (:JH: N( JHCONHCH-CO-NH-CHz-CONH;

Pro .Arg Gly a clear solution. However, the solution may also be used and its physiologically acceptable acid addition salts.

as such, if desired after diluting with water or a salt solution.

For purposes of removing the inorganic salts, the above mentioned solution which has been brought to a pH value of 4.5 may be reduced in volume and subse- References Cited Huguenin et al., I, Helv. Chim. Acta. 45 1632-1633 (1962).

Huguenin et al., II, Experientia 21, 68-69. (1965).

Kimbrough et al., J. Biol. Chem. 238, 1411-1413 (1963).

LEWIS GO'ITS, Primary Examiner.

MELVYN M. KASSENOFF, Assistant Examiner. 

